# if 5>12:
#     print("5 is greater than 12")
#     print("222222")
# else:
#     print("5 is greater than 12")


# age = 30
# if age<18:
#     print("You are underaged")
# elif age >=18 and age < 30:
#     print("You are young")
# elif age >=30 and age<50:
#     print("You are middle-aged")
# else:
#     print("You are old")

# #判断闰年
# year=int(input("请输入年份："))
# if(year % 4==0 and year % 100!=0)or(year % 400==0):
#     print("%d是闰年" % year)
# else:
#     print("%d不是闰年" % year)
# a b c比较大小
a = int(input("请输入a"))
b = int(input("请输入b"))
c = int(input("请输入c"))
if a > b:
    if a > c:
        print("a is the largest")
    else:
        print("c is the largest")
else:
    if b > c:
        print("b is the largest")
    else:
        print("c is the largest")

    # 计算实现加减乘除
    num1 = float(input("请输入第一个数字： "))
    num2 = float(input("请输入第二个数字： "))
    op = input("请输入运算符")
if op == "+":
    print(num1 + num2)
elif op == "-":
    print(num1 - num2)
elif op == "*":
    print(num1 * num2)
elif op == "/":
    print(num1 / num2)
else:
    print("输入错误")
